Consider the 147 pairs of pulse rates and white blood cell counts for adult females from Data Set 1.
Consider the 147 pairs of pulse rates and white blood cell counts for adult females from Data Set 1 “Body Data” in Appendix B. The scatterplot located to the left below shows the regression line. If we include an additional pair of data, x = 30 and y = 100, we get the regression line shown to the right below. The additional point (30, 100) is an influential point because the graph of the regression line did change considerably, as shown by the regression line located to the right below. Compare the two graphs to see clearly that the addition of this one pair of values has a very dramatic effect on the regression line, so that the additional point (30, 100) is an influential point. The additional point is also an outlier because it is far from the other points. Apr 06 2022 11:33 AM
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